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MOS requires a paid software license and support contract. It offers technical support notes, bug access, request tracking and patches. It is the only place you can get critical updates and patch sets to, for instance.
Also Dan Morgan Said Once That you could have MOS account by buying Cheap Products from Oracle Store.
Check the below link
As a side note, having a CSI won't give you the rights to download/use the software patches that you did not paid the support for.
If that's for your personal studying, you most likely don't need patches.
If that's for your own business, consider the Personal Edition.